JPH01100268A - Differential-pressure sealing device - Google Patents

Abstract

PURPOSE:To realize high-differential pressure sealing without causing local surface pressure and vibrations by jointly using an attachment having plural grooves crossing the longitudinal direction of a long-sized thin steel strip with a single guide roll. CONSTITUTION:The differential-pressure sealing device is formed from the single guide roll 2 for guiding the winding of a long-sized thin steel strip 1 at the boundary between the spatial regions having a pressure difference and the sealing attachment 3. One surface of the attachment 3 is approached to the surface of the strip 1 on the roll 2, and plural grooves 3a are cut on the attachment surface along the surface of the strip 1. In addition, one end of the attachment 3 is approached to the outer periphery of the roll 2, the tip lies along the outer periphery of the roll 2, and airtightness is maintained.

Description

[Detailed Description of the Invention] (Industrial Application Field) While continuously feeding a long material such as a long ribbon, such as a cold-rolled or hot-rolled steel strip, vacuum evaporation, ion blasting, sputtering, etc. When applying a surface coating using the so-called dry rating method, the degree of vacuum is increased and then lowered in order to reach the dry rating area by using multiple spatial regions with different pressures (hereinafter referred to as differential pressure chambers). Air-to-Air
) method is used, which requires a differential pressure seal that maintains the pressure difference between the differential pressure chambers and guides the continuous passage of the two long pieces, and here an appropriate differential pressure seal is advantageous. This paper attempts to propose a differential pressure sealing device that can be realized.

(Prior Art) Many proposals regarding the air-to-air system can already be found, including U.S. Patent No. 2,384,500, U.S. Pat. No. 6
Coupled with recent advances in precision machining technology, practical applications are progressing, such as Nos. 21 to 7. Among these sealing methods, the last cited document in particular describes a method in which a long material is sandwiched between a pair of rolls whose axes are slightly shifted in the direction of sheet threading, and the long material is placed along the circumferential surface of each roll. , expanding the sealing area has recently been proposed in Japanese Unexamined Patent Application Publication No. 62-1
Publication No. 3572 proposes an attempt to maintain a differential pressure inside the enclosure by combining a pair of threading rolls with a seal bar and an adapter that surround the long material. Since the long material is pressed and passed between a pair of rolls, the workpiece is subjected to bending stress and compressive stress on its front and back surfaces, and is also subjected to large tension.

It has been found that the effects of tension and local surface pressure as described in 2 have a negative effect on product quality, and for example, when the air-to-air method is applied to unidirectional silicon steel sheets, they cause deterioration of magnetic properties. Ta.

In addition to these problems, it was also pointed out that plate cracking is likely to occur due to vibration during sheet threading.

(Problems to be Solved by the Invention) Suitable for processing long ribbons using the air-to-air method, without causing deterioration of product quality or temporary cracking.
It is an object of the present invention to propose a differential pressure sealing device capable of realizing an effective differential pressure seal.

(Means for Solving the Problems) The present invention provides a differential pressure seal that maintains the pressure difference between spatial regions where there is a pressure difference while inducing continuous passage of a long ribbon, which comprises: At the boundary between the regions, there is a single guide roll that guides the winding of the long thin ribbon, and a single guide roll that is arranged so as to surround the long thin ribbon and is located on one side facing the long thin ribbon. A part is close to the ribbon surface on the single guide roll and is formed in a shape along the ribbon surface, and a part on the other opposing side is close to the outer circumferential surface of the roll, and , the tip is formed in a shape that follows the outer circumferential surface of the roll, and is formed in a shape that follows the outer surface of the roll, and the tip is close to the outer surface of the roll, and the opposing portions are substantially airtight. a sealing attachment having a side structure connected to the single guide roll, the sealing attachment having a surface formed in a shape close to the ribbon surface on the single guide roll and along the ribbon surface; It is characterized by having a plurality of grooves that intersect with the longitudinal direction of the ribbon.

Now, FIG. 1 shows an example in which the differential pressure sealing device according to the present invention is applied, in which 1 is a long ribbon, 2 is a guide roll, and 3
is a sealing attachment, 4 is a first differential pressure chamber, 5 is a second differential pressure chamber, and 6 is a third differential pressure chamber, which maintains the pressure difference between the spatial regions where there is a pressure difference. The degree of vacuum of the long ribbon 1 is increased from below the atmospheric pressure p0 to the pressure p in the order of the subscript number, where the value of the differential pressure is highest Po P
First, a case will be described in which the differential pressure sealing device of the present invention is used between positive spatial regions.

A bearing supports a guide roll 2 at the entrance side of the differential pressure chamber casing 7 corresponding to the boundary between the regions, and a long ribbon 1 is wound around the outer periphery of the guide roll 2 at a preset contact angle. Wind it at θ.

The sealing attachment 3 has a concave arc-shaped sealing surface that surrounds approximately half the outer circumference of the guide roll and forms an extremely small gap δ1 with respect to the outer circumferential surface of the guide roll 2 except for the area where the long ribbon 1 is wound. S, a second concave arc-shaped sealing surface s that directly forms very small gaps δ2 and δ4, 63' with the back surface and both side edges of the long ribbon 1 in the winding region; At the back of the concave arc-shaped sealing surface s2 of No. 2, a slit t is provided in the tangential direction of the guide roll 2, and the opening is much larger than the cross-sectional dimension of the long ribbon l. A plurality of grooves 3a intersecting the longitudinal direction of the long ribbon 1 are formed in the arcuate sealing surface s2. FIG. 2(a) illustrates the external appearance of the sealing attachment 3, and FIG. 2(b) illustrates the concave arc-shaped sealing surface SI+SZ facing the guide roll 2 in an easy-to-understand manner.

In the example shown in Figure 1, the differential pressure (p+ J's), (pz Pz) between differential pressure chambers 4.5 and 5.6 is much smaller than the above (po p+). Partly because of that,
A case is shown in which a roll seal with a pair of rolls 8.9 whose axes are shifted in the sheet passing direction is used.

In Table 1, a differential pressure sealing device with the above configuration (see Figure 2) was applied to pass through a cold rolled steel plate after polishing (thickness 0.3 mm, width 500 mm, line speed 15 m/win). The results of the seal performance investigation in the experiment are shown together with the investigation results of other types of devices.

Note that other types of devices include those that are equipped with a sealing attachment that does not have a groove on the second concave arc-shaped sealing surface s2 (see Figure 3), and those that have a sealing attachment that does not have a groove on the second concave arc-shaped sealing surface S2. A plurality of grooves 3b along the longitudinal direction of the long ribbon 1
A type having a sealing attachment (see Fig. 4) was used.

Table 1 As is clear from Table 1, in the differential pressure sealing device equipped with a sealing attachment without a groove, the pressure p on the reduced pressure side can be increased with respect to atmospheric pressure P0 without causing vibration of the steel plate.
However, with the differential pressure sealing device in which the groove 3a is formed intersecting the longitudinal direction of the long ribbon 1, the pressure P+ can be maintained at 150 Torr without causing vibration of the steel plate, which is extremely difficult. It was found that a high differential pressure seal can be achieved. On the other hand, when the groove 3b was formed in the sealing attachment along the longitudinal direction of the long thin strip 1, the pressure pl was about 290 Torr, and the vibration during threading was also large.

The reason why a high differential pressure can be maintained by forming a plurality of grooves 3a that intersect with the longitudinal direction of the long ribbon 1 in the sealing attachment is because the air flow in that region is maintained during the threading of the long ribbon. This is thought to be because turbulence occurs and air resistance increases.

Note that such a differential pressure sealing device is particularly effective in a region where the degree of vacuum is relatively low and turbulent flow or viscous flow, and is less effective in differential pressure sealing in a region where the degree of vacuum is high and molecular flow is high.

(Function) The long ribbon 1 changes from atmospheric pressure Po to pressure p in the first differential pressure chamber 4,
At this time, an extremely small gap δ3. δ2. Since only δ3 and δ3' are extended, an effective differential pressure seal is achieved, and since the long ribbon 1 is wound around a single guide roll 2, a strong It does not receive surface pressure.

Note that δ2. Regarding δ1, if the width of the long ribbon changes, it has to be allowed to be somewhat excessive. It is more preferable to always maintain a small gap even if there is a change in the gap.

The groove 3a formed in the concave arc-shaped sealing surface s2 of the sealing attachment 3 has a width o, i~10 mm, and a depth 0.01~
It is preferable to form a plurality of lines with a pitch of about 5 mm and a pitch of about 1 to 20 mm, and the cross-sectional shape may be arbitrary. In addition, as mentioned previously, creating a groove like this is effective for differential pressure sealing at the boundary of areas with a low degree of vacuum, so even with sealing attachments of the same type, the size of the groove is smaller on the high pressure side with a lower degree of vacuum. It is advantageous to make the groove larger and the pitch thicker (but on the low pressure side where the degree of vacuum is high, by making the groove smaller and the pitch narrower, an even higher differential pressure seal can be achieved).

(Example) Fig. 4 shows that by repeating the differential pressure seal described in Fig. 1 above twice, from po (atmospheric pressure) to p and then p
An example is shown in which a high differential pressure from I to P2 can be achieved more advantageously.

Coconi, plate thickness 0.23+wm, plate width 50011I11 cold rolled! The plate was passed through the lvie line at a line speed of 20 m/min, and the differential pressure seal condition was investigated. The results are shown together with the investigation results for comparative examples.

Table 2 As is clear from Table 2, it was confirmed that an extremely high differential pressure could be maintained according to the present invention.

(Effect of the invention) The differential pressure sealing device of this invention has a single guide roll.
Since it uses an attachment that has multiple grooves that intersect with the longitudinal direction of the long ribbon, a high differential pressure seal is achieved without creating local surface pressure or vibrations that can cause quality deterioration. It is particularly suitable for use when forming a dry rating film on super iron loss unidirectional silicon steel sheets, but can also be applied to mild steels where local surface pressure tends to affect product quality. Needless to say.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a differential pressure sealing device according to the present invention, FIGS. 2(a) and (b) are external views of the main parts, and FIGS. 3 and 4 are external views of the main parts of a comparative example. FIG. 5 is a schematic diagram showing an embodiment of the present invention. 1... Long ribbon 2... Guide roll 3
...Attachment 4.5.6...Differential pressure chamber 7
・・・Differential pressure chamber casing 8, 9...Roll s,・
...Concave arc-shaped sealing surface S, ...Second concave arc-shaped sealing surface t...Slit Fig. 2 (a) ('b)

Claims (1)

[Claims] 1. In a differential pressure seal that maintains the pressure difference and guides continuous passage of a long ribbon between spatial regions having a pressure difference, at the boundary between the spatial regions. a single guide roll for guiding the winding of the long thin ribbon; is formed in a shape close to and along the ribbon surface on the guide roll, and a part of the other opposing side is close to the outer circumferential surface of the roll,
and the tip is formed in a shape that follows the outer circumferential surface of the roll, and is formed in a shape that follows the outer surface of the roll, and the tip is close to the outer surface of the roll and substantially covers both of the opposing portions. It consists of a sealing attachment having a side structure connected to maintain airtightness, and the sealing attachment is close to the thin strip surface on the single guide roll and has a surface formed in a shape along the thin strip surface. ,
A differential pressure sealing device characterized by having a plurality of grooves that intersect with the longitudinal direction of the ribbon.